CN105004639A - Visual evaluation method of diffusivity of gel in micro-channels of rock - Google Patents
Visual evaluation method of diffusivity of gel in micro-channels of rock Download PDFInfo
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Abstract
The invention relates to a visual evaluation method of the diffusivity of gel in micro-channels of a rock, and belongs to the fields of recovery efficiency improvement technologies and experiment hydrodynamics in petroleum engineering. A low field nuclear magnetic resonance imaging technology is adopted to research distribution of the gel in the micro-channels, and a nuclear magnetic resonance imaging technology and a T2 spectrum analysis technology are adopted to directly observe the distribution of the gel in the micro-channels of a porous medium in rock core displacement experiments; the area, the leading edge, the trailing edge, the center and other parameters of the gel can be obtained through extracting gel images according to nuclear magnetic resonance image; and the diffusivity of the gel in the rock core is quantitatively characterized through calculating the static diffusion ratio and the dynamic diffusion ratio of the area. The method allows the diffusion feature of the gel in the porous medium to be visually described.
Description
Technical field
The present invention relates to the diffusible visual evaluating method of a kind of gel in rock microchannel, belong to petroleum engineering and improve recovery efficiency technique and experimental fluid mechanics field.
Background technology
In laboratory, rock core displacement test is a kind of method of generally acknowledged research rock core fluid flow inside, be widely used in the field such as oil development and environmental science, but because rock core has not visible feature, the flowing of fluid in rock core can only carry out indirect expression with pressure and flow two indices, or according to pressure---discharge relation, utilizes method for numerical simulation indirectly to characterize.Low-field nuclear magnetic resonance is development in recent years new and high technology rapidly, has had good application in medical treatment and food service industry.How to make rock core displacement process in laboratory more directly even visual, become the target that petroleum engineering technical field lays siege to and the important process carried out.In petroleum engineering, usually adopt the macropore injecting gel shutoff porous medium, regulate the flow channel injecting liquid, improve sweep area and oil displacement efficiency.But rock core flowing experiment traditional at present can only describe or deduce the flow condition of fluid in rock core inside and Flooding Efficiency by the bulk parameter (such as top hole pressure, inlet pressure, flow velocity etc.) on end or border usually.Rock core is just equivalent to a black box for researcher, accurately cannot understand the fluid motion conditions of its inside.
Summary of the invention
The difficult problem characterized is difficult to for the diffusivity of current gel in rock core, the object of this invention is to provide the diffusible visual evaluating method of a kind of gel in rock microchannel, rock core flowing experiment and magnetic resonance detection technology are combined, makes the diffusion characteristic of gel in porous medium obtain describing more intuitively.
For achieving the above object, the present invention adopts following technical scheme:
The diffusible visual evaluating method of gel in rock microchannel, comprises the steps:
(1) open nuclear magnetic resonance equipment, after the rock core of saturation water is put into magnet, by NMR imaging determination rock core position, make it be in magnetic field center; The slice thickness of rock core sagittal plane and xsect, slice spacings and slice position are arranged, utilizes low-field nuclear magnetic resonance equipment to obtain rock microchannel inner fluid signal in rock core displacement test.
(2) gray level image extracts.Gray level image is by bright dark sign rock core inner diverse location place signal power (signal is more strong brighter, and signal is more weak darker).
(3) area-of-interest (ROI) extracts.Nuclear-magnetism image pick-up signal form is the form of 100mm × 100mm, and rock core sagittal plane is the rectangle of 90mm × 25mm, and xsect is the circle of diameter 25mm, so need the effective coverage of extracting gray level image.
(4) unified mapping.Often open nuclear magnetic resonance gray level image secretly bright according to the display of its own signal power, for the signal in more different picture is strong and weak, the nuclear magnetic resonance picture of same section must be carried out bright showing slinkingly according to unified standard and show.
(5) rock core skeleton is extracted.For determining the skeleton structure of rock core, binary conversion treatment being carried out to the nuclear-magnetism image of saturated core, being separated rock core skeleton and fluid information.
(6) pseudo-coloured silk is added.To gray scale rock core after reunification, add JET pseudo-color, make the differentiation of gel and water more obvious.
(7) gel images is extracted.Extract gel images according to nuclear magnetic resonance image, obtain the parameters such as gel area, gel leading edge, gel trailing edge and gel center.
(8) the static diffusion ratio of gel characterizes: the water of the certain volume of voids of displacement, after adopting time solidifying, the area of gel is divided by the static diffusion ratio of area as gel of waiting solidifying front gel, first calculate each sagittal static diffusion ratio, then average and be designated as the static diffusion ratio of gel in whole rock core;
In formula: S
1for waiting solidifying front gel distribution area, mm
2; S
2for waiting solidifying rear gel shutoff area, mm
2;
k jfor static diffusion ratio, dimensionless.
(9) the dynamic diffusion ratio of gel characterizes: in water drive process, the area of gel is the dynamic diffusion ratio of gel divided by the area of gel after injection gel, first calculate each sagittal dynamic diffusion ratio, then average and be designated as the dynamic diffusion ratio of gel in whole rock core;
In formula: S
3for the area of gel in water drive process, mm
2;
k dfor dynamic diffusion ratio, dimensionless.
(10) weigh the diffusible change of gel by static diffusion ratio and dynamic diffusion ratio, static diffusion ratio and dynamic diffusion ratio larger, illustrate that gel diffusivity is stronger; Static diffusion ratio and dynamic diffusion ratio less, illustrate that gel diffusivity is poorer.
The range of size diameter 25mm of described rock core, length 60mm ~ 180mm.
Described core permeability scope 500mD ~ 5000mD.
The pressure limit of displacement in described step 8) is 0.01MPa ~ 20MPa.
The fluctuations in discharge scope of displacement in described step 8) is 0.1ml/min ~ 5ml/min.
Compared with prior art, the present invention has following outstanding substantive distinguishing features and significant advantage:
The present invention adopts low-field nuclear magnetic resonance imaging technique to study gel diffusivity in microchannel and characterizes, and rock core flowing experiment and magnetic resonance detection technology is combined, makes the diffusion characteristic of gel in porous medium obtain describing more intuitively.
Accompanying drawing explanation
Fig. 1 is that gel diffusion ratio characterizes schematic diagram.
Fig. 2 is gel sagittal plane nuclear-magnetism distributed image in rock core.
Fig. 3 is gel diffusion ratio characterization result.
Fig. 4 is gel character parameter list.
Embodiment
After now the present invention's specific embodiment being by reference to the accompanying drawings described in.
The diffusible visual evaluating method of a kind of gel in rock microchannel of the present embodiment, testing procedure is:
(1) open nuclear magnetic resonance equipment, after the rock core of saturation water is put into magnet, by NMR imaging determination rock core position, make it be in magnetic field center; To rock core sagittal plane and xsect slice thickness is set to 0.7cm, slice spacings is set to 0.1cm and slice position is arranged, utilize low-field nuclear magnetic resonance equipment to obtain rock microchannel inner fluid signal in rock core displacement test;
(2) gray level image extracts.The gray level image of gel in rock core is extracted by nuclear magnetic resonance.
(3) area-of-interest (ROI) extracts.The rectangle extracting 90mm × 25mm is the effective coverage of gray level image.
(4) unified mapping.The unified scope mapped of all sagittal plane is 1 ~ 100000 zero dimension equivalent luminance unit.
(5) rock core skeleton is extracted.Carry out binary conversion treatment to the nuclear-magnetism image of saturated core, definition rock core skeleton is 15000 zero dimension equivalent luminance units with the threshold values that is separated of fluid.
(6) add pseudo-coloured silk: to gray scale rock core after reunification, add JET pseudo-color, make the differentiation of gel and water more obvious.
(7) gel images is extracted.Extract gel images according to nuclear magnetic resonance image, extract and the results are shown in Figure 2.Obtain the parameters such as gel area, gel leading edge, gel trailing edge and gel center.Extraction the results are shown in Figure 4.
(8) the static diffusion ratio of gel characterizes: the water of the certain volume of voids of displacement, adopt wait solidifying after the area of gel divided by the static diffusion ratio of area as gel injecting gel after gel, first each sagittal static diffusion ratio is calculated, as shown in Figure 1, then average and be designated as the static diffusion ratio of gel in whole rock core, and result of calculation is drawn, mapping result is shown in accompanying drawing 3.
In formula: S
1for waiting solidifying front gel distribution area, mm
2; S
2for waiting solidifying rear gel shutoff area, mm
2;
k jfor static diffusion ratio, dimensionless.
(9) the dynamic diffusion ratio of gel characterizes: in water drive process, the area of gel is the dynamic diffusion ratio of gel divided by the area of gel after injection gel, first each sagittal dynamic diffusion ratio is calculated, then average and be designated as the dynamic diffusion ratio of gel in whole rock core, and result of calculation is drawn, mapping result is shown in accompanying drawing 3.
In formula: S
3for the area of gel in water drive process, mm
2;
k dfor dynamic diffusion ratio, dimensionless.
(10) by the sign of static diffusion ratio and dynamic diffusion ratio, gel dynamic diffusion ratio in migration process can be obtained and be greater than static diffusion ratio.
Claims (5)
1. the diffusible visual evaluating method of gel in rock microchannel, is characterized in that, comprise the steps:
1) open nuclear magnetic resonance equipment, after the rock core of saturation water is put into magnet, by NMR imaging determination rock core position, make it be in magnetic field center; The slice thickness of rock core sagittal plane and xsect, slice spacings and slice position are arranged, utilizes low-field nuclear magnetic resonance equipment to obtain rock microchannel inner fluid signal in rock core displacement test;
2) gray level image extracts: gray level image is strong and weak by bright dark sign rock core inner diverse location place fluid signal, and signal is more strong brighter, and signal is more weak darker;
3) region of interesting extraction: the effective coverage of extracting gray level image at nuclear-magnetism image pick-up signal form, wherein nuclear-magnetism image pick-up signal form is the form of 100mm × 100mm, wherein rock core sagittal plane is the rectangle of 90mm × 25mm, and xsect is the circle of diameter 25mm;
4) unified mapping: the nuclear magnetic resonance picture of same section carries out bright showing slinkingly according to unified standard and shows;
5) extract rock core skeleton: binary conversion treatment is carried out to the nuclear-magnetism image of saturated core, be separated rock core skeleton and fluid information, determine the skeleton structure of rock core;
6) add pseudo-coloured silk: to gray scale rock core after reunification, add JET pseudo-color, make the differentiation of gel and water more obvious;
7) extract gel images: extract gel images according to nuclear magnetic resonance image, obtain gel area, gel leading edge, gel trailing edge and gel center parameter;
(8) the static diffusion ratio of gel characterizes: the water of the certain volume of voids of displacement, after adopting time solidifying, the area of gel is divided by the static diffusion ratio of area as gel of waiting solidifying front gel, first calculate each sagittal static diffusion ratio, then average and be designated as the static diffusion ratio of gel in whole rock core;
In formula: S
1for waiting solidifying front gel distribution area, mm
2; S
2for waiting solidifying rear gel shutoff area, mm
2;
k jfor static diffusion ratio, dimensionless;
(9) the dynamic diffusion ratio of gel characterizes: in water drive process, the area of gel is the dynamic diffusion ratio of gel divided by the area of gel after injection gel, first calculate each sagittal dynamic diffusion ratio, then average and be designated as the dynamic diffusion ratio of gel in whole rock core;
In formula: S
3for the area of gel in water drive process, mm
2;
k dfor dynamic diffusion ratio, dimensionless;
10) weigh the diffusible change of gel by static diffusion ratio and dynamic diffusion ratio, static diffusion ratio and dynamic diffusion ratio larger, illustrate that gel diffusivity is stronger; Static diffusion ratio and dynamic diffusion ratio less, illustrate that gel diffusivity is poorer.
2. the diffusible visual evaluating method of gel according to claim 1 in rock microchannel, is characterized in that, the range of size diameter 25mm of described rock core, length 60mm ~ 180mm.
3. the diffusible visual evaluating method of gel according to claim 1 in rock microchannel, is characterized in that, described core permeability scope 500mD ~ 5000mD.
4. the diffusible visual evaluating method of gel according to claim 1 in rock microchannel, is characterized in that, the pressure limit of displacement in described step 8) is 0.01MPa ~ 20MPa.
5. the diffusible visual evaluating method of gel according to claim 1 in rock microchannel, is characterized in that, the fluctuations in discharge scope of displacement in described step 8) is 0.1ml/min ~ 5ml/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113358683A (en) * | 2021-06-11 | 2021-09-07 | 西南石油大学 | Water flooding experimental device and method for researching core end face effect |
| CN114441375A (en) * | 2022-01-28 | 2022-05-06 | 中国石油大学(北京) | Carbonate rock model and carbonate rock chemical flooding performance testing method |
| CN115728190A (en) * | 2022-11-29 | 2023-03-03 | 鲁东大学 | Grouting anchor rod cable slurry diffusion effect evaluation method based on three-dimensional imaging technology |
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| CN115728190A (en) * | 2022-11-29 | 2023-03-03 | 鲁东大学 | Grouting anchor rod cable slurry diffusion effect evaluation method based on three-dimensional imaging technology |
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